<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            width: 200px;
            height: 200px;
            margin-top: 50px;
            /* 
              display(显示)： none  隐藏
                             block  以快级元素显示
                             inline: 以行级元素显示
                             inline-block:  行块显示
                             flex: 弹性布局
            */
        }

        .one{
            background-color: coral;
            display: none;
        }
        .two{
            background-color: chartreuse;
        }

    </style>
</head>
<body>
    

    <div class='one'></div>
     <div class='two'></div>

</body>
</html>